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American Potato Journal

, Volume 67, Issue 7, pp 427–441 | Cite as

Assessment of field responses of potato cultivars and breeder seedlings to potato late blight epidemics

  • H. W. (Bud) Platt
  • K. B. McRae
Article

Abstract

The response to potato late blight of 116 potato cultivars and breeding lines was determined in replicated trials conducted between 1980 and 1988. The index of area under the standardized disease progress curve (ASDPC), based on the cultivar Sebago, was used to rank the cultivars and to identify cultivars that had inconsistent disease responses over years. Most of the cultivars were susceptible to late blight; only 10 cultivars out of 66 currently available (including breeding lines) were judged more resistant than Sebago. Nine cultivars were identified as having inconsistent resistance over years. The index ASDPC was less variable than the relative area under the disease progress curve when the yearly disease conditions differed from the normal.

Additional key words

Phytophthora infestans Solanum tuberosum disease resistance standardized disease progress curve 

Compendio

En ensayos con repeticiones, conducidos entre 1980 y 1988, se determinó la respuesta de 116 cultivares de papa y líneas de mejoramiento al tizón tardÍo de la papa. El índice de área bajo la curva estandarizada de progreso de la enfermedad (ASDPC), basado en el cultivar Sebago, fue, utilizado para clasificar los cultivares e identificar aquellos que en varios años tuvieron respuestas inconsistentes a la enfermedad. La mayoría de los cultivares fueron susceptibles al tizón tardío y solamente diez de ellos, de un total de 66 disponibles en esa oportunidad (incluyendo lÍneas de mejoramiento), fueron considerados más resistentes que Sebago. Fueron identificados nueve cultivares con resistencia inconsistente en varios años. Cuando las condiciones anuales de la enfermedad fueron diferentes a las normales, el índice ASDPC fue menos variable que el área relativa bajo la curva de progreso de la enfermedad.

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Literature Cited

  1. 1.
    Eide, C.J. and F.L. Lauer. 1967. Testing potatoes for field resistance to late blight. Am Potato J 44:9–16.CrossRefGoogle Scholar
  2. 2.
    Fry, W.E. 1978. Quantification of general resistance of potato cultivars and fungicide effects for integrated control potato late blight. Phytopathology 68:1650–1655.CrossRefGoogle Scholar
  3. 3.
    Latin, R.X., D.R. MacKenzie and H. Cole, Jr. 1981. The influence of host and pathogen genotypes on the apparent infection rates of potato late blight epidemics. Phytopathology 71:82–85.CrossRefGoogle Scholar
  4. 4.
    Lin, C.S., M.R. Binns and L.P. Lefkovitch. 1986. Stability Analysis: Where do we stand. Crop Sci 26:894–900.CrossRefGoogle Scholar
  5. 5.
    Malcolmson, J.F. 1976. Assessment of field resistance of blight (Phytophthora infestans) in potatoes. Trans Br Mycol Sco 67:321–325.CrossRefGoogle Scholar
  6. 6.
    Malcolmson, J.F. and R.J. Killick. 1980. The breeding value of potato parents for field resistance to late blight measured by whole seedlings. Euphytica 29:489–495.CrossRefGoogle Scholar
  7. 7.
    Nilsson, B.A. 1981. Component analysis of general resistance toPhytophthora infestans in clones from the Columbian potato collection. Potato Res 24:239–244.CrossRefGoogle Scholar
  8. 8.
    McRae, K.B. and H.W. Platt. 1987. An index for cultivar resistance based on disease progress curves. Phytopathology 77:1181–1186.CrossRefGoogle Scholar
  9. 9.
    Piatt, H.W. and G.C.C. Tai. 1984. Assessment and analyses for the interpretation of potato late blight field studies. Am Potato J 61:599–609.CrossRefGoogle Scholar
  10. 10.
    Tai, G.C.C. and W.A. Hodgson. 1975. Estimating general combining ability of potato parents for field resistance to late blight. Euphytica 24:285–289.CrossRefGoogle Scholar
  11. 11.
    Winer, B.J. 1971. Statistical Principles in Experimental Design. McGraw-Hill, New York, N.Y.Google Scholar

Copyright information

© Springer 1990

Authors and Affiliations

  • H. W. (Bud) Platt
    • 1
  • K. B. McRae
    • 2
  1. 1.Research StationAgriculture CanadaCharlottetown
  2. 2.Research StationAgriculture CanadaKentvilleCanada

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